Bushing



Jan. 23, 1945. E. F. RIE-:SING

BUSHING Original Filed Dec. 27, 1940 Patented Jan. 23, 1945 RUSHING Ellwood F. Riesing, Pontiac, Mich., assignor to The Firestone Tire & Rubber Company, Akron, Ohio, a corporation of Ohio Original application December 27, 1940, Serial N o. 371,904, now Patent No. 2,308,965, January 19, 1943. Divided and this application November 26, 1942,-Serial No. 467.024

2 Claims.

This invention relates to bushings and bushing assemblies, especially to bushings functioning as insulators connecting two movable parts Without transmitting vibrations from one part to the other.

This application is a division of my copending application Serial No. 371,904, filed December 27, 1940, now matured into Patent No. 2,308,965 issued January 19, 1943.

One example of accessories of the above type is that between a gear shift shaft and an arm connecting to the transmission. In such cases, a bushing has been used which comprises inner and outer metal sleeves with a rubber body ex-l tending between and being vulcanized to both the inner and outer sleeves. These bushings are objectionable in that they must be made to an exact size in order to fit in the apparatus properly and such bushings are rather expensive, especially with relation to the bushings of the present invention.

A general object of the present invention is to provide an improved, inexpensive, easily manufactured rubber bushing adapted to preventA transmission of vibration between the metal parts which it connects, while also enabling one part to move with relation to the second part.

Another object of the invention is to provide a rubber bushing especially adapted to connect a shaft to an associated member.

The foregoing and other objects will appear as the description proceeds.

The invention is described with particular reference to the accompanying drawing of which:

Figure 1 is a plan of a bushing assembly embodying the invention;

Figure 2 is a side elevation of the assembly of Figure l;

Figure 3 is an inverted vertical section on line 3-3 of Figure l;

Figure 4 is an enlarged section through an uncompressed rubber bushing of the invention with the compressed position of the bushing being indicated in dotted lines;

Referring specifically to the accompanying drawing, a metal rod I having an end portion II extending at right angles therefrom is shown. The end portion II is to be connected to an eyelet, or eye, I2 formed at the end of a second metal arm I3 which may extend in substantially the same direction as the arm I0.

The end portion II of the arm I0 is connected to the eyelet I2 through the agency of a bushing I4 which comprises a metal sleeve I5 to which is vulcanized an annular rubber body I6. The sides of the rubber body IB taper axially inwardly as they extend radially outwardly from the sleeve I5. Annular flanges I1 and I8 are formed at the edges of the rubber body I6 with the liange I8 being substantially thicker and extending farther from-'the rubber body I6 than the flange I'I. The flanges I1 and I8 are adapted to engage With the sides of the eye I2 and retain the bushing I4 in position. The diameter of the rubber body IB is made slightly larger than the inner diameter of the eye I2, while the distance between the confronting faces of the flanges I'I and I8 is less than the thickness of the eye. Hence the rubber bushing must be compressed radially and expanded axially to be positioned between the end II of arm I0 and the eye I2. Such compression and tension set up in the rubber body IB materially aids the rubber bushing in retaining itself in engagement with the eye. Initial engagement of the bushing I4 and eye may be facilitated by forming ,the flange I'I smaller than the flange I8 which expedites forcing the bushing-vinto engagement With the eye.

lThe rubber bushing may be soaped to aid in slipping it into position.

The metal sleeve I5 is adapted to slide over the end of the arm II, and to be retained in engagement therewith by a cotter pin I9 that extends through a hole IIa in the end of the arm. A washer 20 may be positioned between the sleeve and the cotter pin, as shown, to aid in positioning the bushing. l

It should be noted .that the bushings of the invention are adapted to be used to connect rods or other elements having very light loads applied thereto. That is, the bushing constructions are to be used in transmitting forces in the nature of one-half to one and one-half pounds.

From the foregoing it will be seen that a simple, easily constructed, inexpensive rubber bushing is provided by the invention. This bushing does not have to be made to an exact size, with the result that it is easy to manufacture. The use of but one metal sleeve in the bushing is a feature of the invention. i I

While but one embodiment of the invention has been illustrated and described it will be appreciated that modifications thereof may be made without departing from the scope of the invention, as defined in the appended claims.

What is claimed is: l

1.A bushing assembly comprising a rod having an end portion extending at right angles to the part of the rod immediately thereadjacent, an arm having an eyelet formed at the end y thereof, a metal sleeve engaged with the end of said rod, said sleeveextendlng through said eyelet, a rubber bushing vulcanized to said sleeve, said rubber bushing having spaced radially outwardly extending flanges at the edges thereof, said flanges defining an annular groove therebetween, said eyelet interposed in said groove, the width of said groove being less than the width of said eyelet and the diameter of said bushing at the base of said groove being greater than the inside diameter of said eyelet, one of said flanges being radially shorter than the other, whereby the assembly of the eyelet and the bushing is facilitated and whereby said bushing 2. In combination, two load arms connected and retained in spaced relation by a rubber bushing, said bushing being vulcanized to a rigid sleeve which sleeve is carried on one of said arms, said bushing having spaced radially outwardly extending annular flanges, one of said flanges being radially longer than the other, the other of said arms having an eyelet formed on one of its extremities, said bushing being interpositoned in said eyelet, the body portion of said bushing being radially compressed and the said flange portions axially expanded by said eyelet, whereby vibrations from one arm to the other are dampened and one arm is permitted to move is compressed radially within said eyelet and 15 with relation to the other'arm. stretched laterally at the edges thereof.

ELLWOOD F. RIESING. 

